Sunny with pleasantly warm air temperatures (feeling like 21 °C once we account for wind), yet at 17 °C the sea remains several degrees colder than the air at Tweede Steen. The majority of surfers will need a spring wetsuit though a summer suit or even a shorty may suffice for a short session.

Tweede Steen sea temperatures peak in the range 19 to 22°C (66 to 72°F) on around the 3rd of February and are at their lowest on about the 10th of August, in the range 14 to 16°C (57 to 61°F). Tweede Steen sea temperatures are maximum at the start of February. Surfers should use a 2mm long sleeve shorty or a 3/2mm spring wetsuit if the wind is up. The lowest seasonal sea temperatures at Tweede Steen in early to mid August lend themselves to a 4/3mm wetsuit or a 3/2mm suit and 3mm neoprene boots.